Simple text explains fractions, what they are, and how to use them.

Simple text introduces the concept of time and how time is measured using the sun, calendars, clocks, watches, and timers.

"Introduces readers to patterns, including those that can be found in nature, such as animal fur, and those used when counting by ones and fives." --

Simple text explains graphs, how they work, and how they can be used.

Explains the Roman numeral system, which, though very old, is still in use today.

Count from one to twenty-six and learn about the many different kids of butterflies in the world. Gorgeous art by Shennen Bersani brings these beautiful insects to life, and Jerry Pallotta's signature humor and amazing facts make this a great read for all ages. --Publisher's description.

Describes, through use of diagrams and illustrations, the basicconcept of fractions, specifically halves, thirds, and fourths.

"Explains through simple experiments the principle of dimensions and how they are measured." --

Explains in simple terms the concept of positive and negative numbers.

Briefly explains the matching and comparison of quantities, the naming and ordering of numbers, and counting--all steps in the history of numbers.